IntersectionObserver – 有爱前端

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>IntersectionObserver</title>
</head>
<body style="font-size: 24px;text-align: center">
<div id="container"></div>
<div id="loadMore">加载中...</div>
</body>
<script>
  const container = document.querySelector('#container');
  const loadMore = document.querySelector('#loadMore');
  let index = 0;

  const loadItems = (count) => {
    [...Array(count).keys()].forEach((key) => {
      const p = document.createElement('P');
      p.innerHTML = `${key + index}`;
      container.appendChild(p)
    })
    index += count;
  }

  const observer = new IntersectionObserver((entries) => {
    entries.forEach(({ isIntersecting }) => {
      if (isIntersecting) {
        loadItems(20);
      }
    })
  });

  observer.observe(loadMore)
</script>
</html>
转载请注明：有爱前端 » IntersectionObserver